Head-block for sawmills



UNITED STATES PAgTENT OFFICE.

J. KURTZEMAN, OF LANCASTER, OHIO.

HEAD-BLOCK FOR SAWMILLS.

Specification of Letters Patent No. 24,743, dated J' uly 12, 1859.

To all lwhom t may concern:

Be it known that I, JOSEPH KURTZEMAN, of Lancaster, in the county ofFairfield and State of Ohio, have invented a new and use ful Improvementin Head-Blocks for Sawmills; and I do hereby declare that the followingis a full, clear, and exact description of the same, reference being hadto the accompanying drawings, making a part of this specification, inwhich- Figure 1, is a longitudinal vertical section of my invention,taken in the line w, fw, of Fig. 4. Fig. 2, is a transverse verticalsection of the same, taken in the line 0:, fc, of Fig. 1. Fig. 3, is adetached side View of a portion of the same. Fig. 4, is a plan or topview of the whole of the same.

Similar letters of reference denote like parts in all the figures.

This invention consists in a novel arrangement of gearing for actuatingthe slides to which the dogs are attached, as hereinafter fully shownand described, whereby both blocks may, by actuating a single lever, bemoved or adjusted simultaneously and the log set bodily to the saw andparallelly with its cutting plane, when stuff of equal thickness is tobe sawed, or set obliquely with the cutting plane of the saw when stuffof taper form is to be sawed.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A, represents a saw-mill carriage which may be constructed in the usualway; and B, B', are two blocks secured transversely on the carriage oneon each end. In each block B, B', a groove or recess a, is madelongitudinally, and in each groove or recess a, a slide C, is fitted andallowed to move freely back and forth. In the upper parts of the slidesC, dogs b, b, are placed, as shown clearly in Figs. l and 4, and to thelower parts of the slides C, C, are attached racks c, c, one to eachslide, said racks being within the grooves a. Into the rack c, of eachslide, a pinion D gears; and these pinions are attached to verticalarbors E, E, that pass into the blocks B, B', and are allowed to rotatefreely therein. To the lower end of each arbor E, a bevel wheel F isattached.

G is a rack which is tted longitudinally in the under side of thecarriage A. This rack is fitted in grooves d, in the under side of theblocks B, B', and when desired is kept in gear by means of wedges e, e,with pinions H, the bearings `of which are secured to the under sides ofthe blocks B, B'.

To one side of each pinion H, a bevel pinion I, is attached, and thesepinions gear into the bevel wheels F, which are attached to the lowerends of the arbors E, E.

To the block B, a bracket J, is attached; this bracket is formed of twoparts g, 7L; the parts g, being permanently attached to the block B, andthe part /L secured to the part g, by a pivot z', and a set screw j,which screw passes through a curved slot 7c, in the part g, and into thepart z.; see more particularly Fig. 3.

To the lower end of the part 7L, of the bracket J, a horizontal arm Z,is attached, and on this arm a collar m, is placed loosely; said collarhaving a pinion a, attached to it, which pinion gears into the rack Gr.ratchet 0, also, is placed on the collar m, with which when necessary, apawl p, is made to engage by means of a lever K, the fulcrum of which isthe collar m. To the block B a curved guide (l, is attached, in whichguide the lever K, is fitted.

The operation is as follows z-*The log L, shown in red is placed on thecarriage A, one end resting on each block B, B', as shown clearly inFig. 1. The carriage A is operated, that is to say, moved toward the sawand gigged back from it in the usual or in any proper way. In order toset the log L, to the saw, the lever K, is braced down and the pawl pengages with the ratchet O, and the pinion n, moves the rack G; and thisrack, through the medium of the gearing H, I, F, D, and the other ra-cksc, c, on the slides C, moves said slides simultaneously and the log willbe set to the saw parallel with its cutting plane and so that the sawmay cut boards or stuit of greater or less thickness as may be desired;the latter result being obtained by moving the lever K, a greater orless distance. The wedges c, c, keep the rack G, in gear with thepinions I, I, said wedges forming upper bearings for the rack. By theemployment or use of t-hese wedges, boards or stuff may be sawed fromthe log in taper form; for, when it is desired to saw stuff in such formthe wedge will still gear into the rack Gr, and the latclaim as new, anddesire to secure by Let- 15 ter be raised aboVe the pinion I, of blockB, ters Patent, is: as shown in red in Fig. 3. The rack G, The slidingrack bar placed longitudinally therefore, when actuated, Will only movethe in the carriage A, and adjusted therein by 5 slide C, of the blockB', and the log will be the Wedges e, e, in connection with thegearpresented obliquely to the cutting plane of ing H, I, F, whereby thetWo slides C, C, 2o the saw and the latter Willconsequently out may, bya suitable adjustment of the Wedges, the stuff in taper form. The Wedgese, e, be actuated both simultaneously and sepanay 'ble readilydjistedhinbland remwleld rately as may be desired.

10 rom t egrooves ,int e ocks, an t e rack Gr, may, by adjusting theWedges e, e, J KURTZEMAN' be made to actuate the slide C, of eitherWitnesses: block E, or E, separately. M. B. PRINDLE,

Having described my invention, what I WM. MITCHELL.

